• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 102 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76952: Does the sine wave charging current of the bidirectional inverter have an adverse effect on the CC2 current acquisition of bq76952?

jmyang
Expert 1151 points
Part Number: BQ76952
Masters of TI,

We plan to use the MCU to read the CC2 current of bq76952, and then use the CC2 current to calculate the Coulomb gas gauge SOC through the MCU.

But we found that when the bidirectional inverter charges the battery, the charging current is a positive selection curve, as shown in the picture below.

The maximum charging current is 55A, the minimum charging current is 25A, and the deviation is 30A. The period of change of a sine wave is 8.6ms.

Can this current CC2 be accurately collected?

Will there be inaccurate collection?
inverter charging current
        
  • 0
    TI__Expert 4085 points

    Dear jmyang,

    CC2 can do it correctly if need be, but per the technical reference manual, CC1 is better optimized for charge integration and more ideal for SOC/SOH calculations than CC2. CC1 samples roughly every 4us so the 8.6ms period shouldn’t be an issue. It produces its result every 250ms based on sampling every 4us, but the value is more accurate than CC2. CC2 will produce a result every 3ms.

    If the calculations are for SOC and SOH, CC1 will be the better filter to use. CC2 is generally used for more immediate current reporting and not SOC. Section 4.3 of the Technical Reference Manual provides a longer explanation of this if you wish to look at it.

    Best,

    Asher Nederveld